By Victor V. Kozlov

The English train mechanics as an experimental technological know-how, whereas at the Continent, it has continually been thought of a extra deductive and a priori technology. definitely, the English are correct. * H. Poincare, technology and speculation Descartes, Leibnitz, and Newton As is celebrated, the fundamental ideas of dynamics have been said by means of New­ ton in his well-known paintings Philosophiae Naturalis Principia Mathematica, whose ebook in 1687 used to be paid for by means of his pal, the astronomer Halley. In essence, this ebook was once written with a unmarried goal: to turn out the equivalence of Kepler's legislation and the belief, steered to Newton via Hooke, that the acceleration of a planet is directed towards the guts of the sunlight and reduces in inverse percentage to the sq. of the space among the planet and the solar. For this, Newton had to systematize the rules of dynamics (which is how Newton's recognized legislation seemed) and to country the "theory of fluxes" (analysis of features of 1 variable). the main of the equality of an motion and a counteraction and the inverse sq. legislations led Newton to the speculation of gravitation, the interplay at a distance. moreover, New­ ton mentioned a number of difficulties in mechanics and arithmetic in his e-book, corresponding to the legislation of similarity, the idea of effect, distinctive vari­ ational difficulties, and algebraicity stipulations for Abelian integrals. nearly every thing within the Principia as a consequence turned vintage. during this connection, A. N.

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Of course, the center of curvature of this curve at the point x lies on the normal. If we rotate the intersecting plane about the normal, then the intersection curve changes. Therefore, the position of 29 §4. Optical-Mechanical Analogy ~ /Y -.... :. 111114 //~ '\\ ~ ~______... / A \1 '! Fig. 9. Caustic on a lens axis .... / / / I Fig. 10. Caustic in a coffee cup the center of curvature and the radius of curvature also change. After a halfrevolution, the radius of curvature passes its maximum and minimum values.

6), where the role of the independent variables x is played by the generalized coordinates and time. The peculiarity of the Hamilton-Jacobi equation is that it does not explicitly contain the unknown function z. Each solution z = z(x) of Eq. 6) defines a hypersurface (integral surface) in the (m+1)-dimensional space of variables { x1, ... , Xm, z} = JRm+l. The vector y = {Yl, ... , Ym, 1} =1- 0 is orthogonal to the integral surface relative to the standard Euclidean metric in JRm+l. A hyperplane in JRm+l passing through the point (x, z) orthogonally to the vector y, whose components satisfy Eq.

Now let light rays intersect a regular surface E orthogonally. We can assume that the contour r 1 lies on E. 8) vanishes because the vectors v1 (x) are orthogonal to r 1 . 8) vanishes for an arbitrary closed 0 contour r 2 . This implies that the field v(x) is a potential field. 4. Let E be a smooth regular surface and v be a vector field of a Hamilton system of rays. We set E 0 =E. By the Malus theorem, the surfaces Et are orthogonal to light rays; the eikonal takes constant values on these surfaces.

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